Beam compass



C. C. REITENBAUGH.

BEAM COMPASS,

APPLICATION FILED JUNE 4, 1920.

ElRNE 5 Patented Jan. 31

nhau JNVENTU ATT 4 EJEPQEi LE j v BEAM comrass.

cameo. REI'IVENBAUGH, or ROGKISLAND, ILLINOIS.

iaearea in its set position, thereby eliminating the a inconveniencesassociated with the com passes now on the market.

-Another object of the invention is to provide an improved drawinginstrument in which the lead can bequickly removed from the marking leg,when it is desired to insert a new piece therein and thus eliminate thedifficulties heretobefore experi enced in removing small pieces of leadfrom the marking leg.

A other object of the invention is to provide an improved beam compassembodying a graduated beam and a sliding marking post or leg mountedonthebeam, the post or leg having an improved means for engaging the beamso as to prevent accidental movement thereon. a

A still further object of the invention is to provide an improvedcompass of the above character which is durable and efiicient in use,one that is simple and easy to manufacture, and onc which can be placedupon the market at a reasonable cost.

lVith these and other objects in view, the invention consists in thenovel constructioin arrangement and formation of parts, as will hehereinafter more specifically described claimorh and illustrated in theac companying drawings, forming a part of this specification, in whichdrawings:

Figure 1 is a side elevation of the improved beam compass. v I

Figure 2 is an enlarged fragmentary longitudinal section taken on theline 22 of Figure 1. I a a a Figure 3 is an enlarged vertical sectiontaken on the line 33 of Figure 1.

Figure 4 is an enlarged transverse section taken on the line 14of Figure1.

Figure 5 is a detail horizontal section taken on the line of Figure 1.

Figure 6 is an enlarged vertical trans Specification of Letters Patent.

Patented J an. 31 1922.

Application filed June 4, 1920. Serial No. 386,426.

verse section through the improved beam compass showing the means foradjustably holding the marking leg or post in position on the beam. I t

Figure 7 is an enlarged fragmentary vertical longitudinal sectionthrough the same taken on the line 7-7 of Figure 4.,

Figure 8 is a detail elevation of the marking pen adapted to bedetachably associated with the movable post.

Figure 9 is a detail elevation of the means for forcing the lead fromthelead carrying leg. V

Figure 10 is an enlarged detail elevation of the leg for carrying themarking lead.

Referring to the drawings, in detail, wherein similar referencecharacters indicate corresponding parts throughout the several views,the letter A genrally indicates the improved beam compass whichincludesthe main needle carrying post 15, the beam 16, the adjustablemarking post 17,

and the lead extractor The main or needle post 15 includes a centralcylindrical body portion 18 which is provided on its opposite sides withflat faces 15) andiwith a bore 20 to conform with the reduced end 21. ofthe beam 16. The reduced end 21 of the beam is provided with a flat face22 which prevents the beam 16 from rotating in bore 20. The reduced end21 of beam 16is provided with a threaded bore 23 in which is fitted. aclamping thumb screw 24. The clamping thumb screw is adapted to engagethe outer surface of the main or needle post 15 and to engage in theserrated. as at 2 5, and theend is concave as at26, so as topermit afirm grip to behad thereon by the draftsman. The lower end I of the mainor needle carrying post 15is gradually tapered toward its free end, andis provided with a slotted recessed terminal for the reception of theneedle 27 which is held in adjusted position against shoe e f-which isprovided with an upwardly means of a leaf spring 418 which is carried bythe housing and the upper sur lfaee of accidental displacement by atapered nut 28 which is threaded, in position on the threaded taperedlower portion of post 15.

The beam 16 includes a substantially cylindrical body vith a reduced end21, and the loweu face of the .body is flattened as at 29 an'd providedwith a plurality of equi-distantly spaced transversely extending notches30 and the forward face of the beam is graduated as at 31 and providedwith suitable indicating numbers to conform to the graduations and therecesses 30' so as to permit of the convenient adjustment of the post17. The extreme outer end of the beam 16 is provided with a head 32which limits the outward movement of the adjusting marking post housing88 thereon.

The adjustable marking postl'l' is carried by the housing 33 which isslidably mounted on the beam 16, and this housing includes spaced endplates 34 and anintermediate partition plate 35. The end plates 3 1above the partition plate are provided on the inner faces with lugs 36,and with openings 37 for the beam 16, and these openings are shaped toconform to the cross sectional configuration of the beam. By this meansthe marking leg is held perpendicular and parallel with needlepost 15. Yi

The end plates 34 ot the partition plate are provided withaligned-openings 38 for the reception of the adjusting screw-39 which ismounted in the threaded bore 40 of on opposite sides of the lugs 36, andthe legs of member all have sec'liu'ed thereto a extending transverselyarraii ed tooth lti, which is adapted to eng in any one at the recesses30. One 01 the oi the U shaped thun'ib pieces 1/1; is provided with asight opening, 67, the purpose of which will hereinafter more fullyappear. I

The outer face of the thumb piece 14 is roughed or serrated as at 47 soas to prevent the slipping of the operators thumb thereon.

Theshoe is normallyheld in engagement with the straight face 29 of thebeam 16 by the partitionplate 35 is provided with a .recessedportion a9for the reception of spring 4,8, Thus it can be seen that lugs 36 act asguides for thumb piece 1 1, and prevent the dissolution of. the markingleg as a whole, when iris desiredto substitute a beam of difi erentlength for beam 16.

The lower end of the adjusting marking post 17, is provided with avertically dis- 'posed'bore 50 for the reception of the legs of thereduced portion 51 of the pencil markingleg 52 and the reduced portion58 of the pen 5%. The reduced portions 51' and 53 of the lead carryingleg 52 and the pen are slotted as at 55 which permitsof the contractionof the reduced portion when the same is fitted in the vertical bore 50of the adjusting marking post 17. A pin 56 is carried by the adjustingor marking post 17 and the same extends through the bore 50 thereof andis adapted to fit in a transversely extended groove 57 formed in thereduced portions 51 and 53 of the lead carryingleg 52 and the pen 54.The upper ends of the reduced portions 51 and 53 of the lead carryingleg 52 and pen 51 are inclined as at 58 above the groove 57 so as topermit the flexing of the slotted reduced portions 51 and 53 of thepencil carrying leg 52 and the pen 54 when either one of the same isbeing placed in the bore 50 of the post 17. The leg 52 is provided withan inwardly extending smooth bore 59 for the reception of the markinglead 60 and-this portionot the lower outer surface of the same istaperedas at 62and is provided with external threads 63. Aninternally taperednut 64: ismounted on the leg 52 and is adapted to bringthe slit portionsotthe leg together to holdthe marking lead 60 against accidentaldisplacement. V

The bore 59 of the leg 52has -slidably mounted therein a 'follower 65 ofcylindrical formation, which is adapted to push the lead 60 out of thebore when the same has become worn down and the cylindrical fol lower 65is provided with an outwardlyextending handle or pin 66 which protrudesthrougl'i the slot fil formed in the leg; Thus it can be seen that whenit is desired to relnovethe lead 60 from the bore it is merely necessaryto loosen the nut 6 1 so to permit the leg to expandand the followeri sthen brought down the bore into eng gement with thelead and thuseffectively lorce. the same out o'lf the bore.

When it is desired to substitute the pen 56 rides into the groove 57formed in its outer surface.

In operation of the improved compass the leg 52 or the pen 54 isassociated with the post 17 according to the character of the 7 workbeing executed, and the thumb piece 44 is moved downwardly against thetension of the spring 48 which moves the tooth 46 from out of engagementwith the notches 30. The housing is then moved to the desired place onthe beam and the marking thereon can be readily seen through theopeningGT provided in the thumb piece id for that purpose. lVhen it isdesired to adjust the leg 52 a fraction of an inch, it is merely neces'sary to turn the adjusting screw. 39 which will permit of as fineadjustment as desired. The compass is then used in the ordinary manner.

Various changes in form, proportions, size and details of the device maybe had without departing from the spirit or sacrificing any of theadvantages of my invention, but,

I claim: a

1. A compass comprising a needle post, an outwardly extending beamcarried by the post having a plurality of equi-distantly spaced notchesformed on its lower face, a housing slidably mounted on said beam, athumb piece slidably carried by the housing, a tooth carried by thethumb piece and arranged to engage in any one of said notches, springmeans normally holding said thumb piece in a raised position and inengagement with one of the notches, and a marking'post adjustablycarried by the housing.v

2. A compass comprising a needle post, an outwardly extending beamcarried by the needle post having a plurality of equi-distantly spacednotches formed therein, a housing slidably mounted on the beam, a shoeslidably carried by the housing, a toot-h formed on the shoe andarranged to engage in any one of the notches, spring 3. In a drawinginstrument. a supporting post having a vertical bore anda pin carried bythe post and arranged in said bore, of a leg having a reduced slottedterminal arranged to fit in said bore, the reduced terminal having a.groove arranged to receive said pin, and provided with an inclinedsurface arranged above said groove.

it. A compass comprising a needle post having a diametrically extendingopening formed therein, the wall of said opening having a flattenedportion, a longitudinally extending graduated beam, a reduced extensionformed on one terminal of the beam arranged to lit in the opening formedin the post, said reduced extension having a fiattened face forengagement with the flattened portion of the wall of the opening,whereby rotary movement of the beam in relation to the post isprevented, the body portion oi? the beam having a lower flattened face,a housing including end walls and a partition plate, inwardly extendinglugs formed on the end walls and spacedi it'rom the upper and side edgesthereof, said side walls and lugs having aligned openings for receivingthe beam, the walls 1 of said openings having the lower portions thereofflattened for engagement with the flattened face of the beam, wherebythe housing is held in parallel relation with the post and againstrotation on said beam, the flattened face of said beam having groovesformed therein, a sliding shoe arranged between the end walls ofthehousing, a tooth formed on said shoe arranged to engage in any one ofsaid grooves, a U-shaped thumb grip slidably mounted on said lugs andsecured to said shoe, said thumb grip having a sight opening therein topermit 01. the reading of the graduations on the beam, and an adjustablemarking leg carried by the housing. V

5. In a compass, the combination, with a needle post, and a beam, of amarking post adjustably carried by said beam, and including resilientmeans forrigidly maintaining said. marking post in position upon thebeam.

6. In a compass, the combination, of a needle post; a beam, and a markerpost, in cluding a housing slid ably carried upon. sa i d beam, saidhousing having guide lugs thereon, a substantially U-sluuied thumb piecereciprocably mounted upon said housing, a shoe u'leniber detacbablyconnected to the open end of said U-sbaped member, a spring detachablycarried by said housing, and nor-- i'ually under (unupression to pushsaid shoe into engagement with said beam, and "a. marking pointadjustably carried by said housing.

' CHARLES C. REITENBAUGH.

